<template>
   <ul class="app-header-nav">
        <li class="home"><RouterLink to="/">首页</RouterLink></li>
        <li v-for="item in list" :key="item.id" @mouseenter="show(item)" @mouseleave="hide(item)">
          <RouterLink :to="`category/${item.id}`" @click="hide(item)" >{{item.name}}</RouterLink>
          <div class="layer" :class="{open:item.open}">
            <ul>
              <li v-for="sub in item.children" :key="sub.id">
                <RouterLink   :to="`/category/sub/${sub.id}`" @click="hide(item)">
                  <img :src="sub.picture" alt="">
                  <p>{{sub.name}}</p>
                </RouterLink>
              </li>
            </ul>
          </div>
          </li>
       
      </ul>
</template>

<script>
import { computed } from 'vue'
import { useStore } from 'vuex'
export default {
  name:'AppHeaderNav',
setup(){
const store= useStore()
const list = computed(()=>{
  return store.state.category.list
})

// 跳转不会自动关闭二级目录  通过数据来控制
// 1.每个分类加上OPen数据
// 2.提供隐藏和显示函数  修改OPen数据
// 3.再组件中使用VUex中的函数 使用时间来绑定，提供一个类名 显示 隐藏类名
const show =(item)=>{
  store.commit('category/show',item.id)
}
const hide =(item)=>{
  store.commit('category/hide',item.id)
}
 return { list, show, hide}
}
}
</script>

<style lang='less' scoped>
  .app-header-nav {
    width: 820px;
    display: flex;
    justify-content: space-around;
    padding-left: 40px;
    position: relative;
   > li {
      margin-right: 40px;
      width: 38px;
      text-align: center;
     > a {
        font-size: 16px;
        line-height: 32px;
        height: 32px;
        display: inline-block;
      }
      &:hover {
        >a {
          color: @xtxColor;
          border-bottom: 1px solid @xtxColor;

        }
        //显示二级类目 弹层
      //   > .layer {
      //   height: 132px;
      //   opacity: 1;
      // }
      }
    }
  }
  //二级类目 弹层
  .layer {
    &.open{
      height: 132px;
      opacity: 1;
    }
  width: 1240px;
  background-color: #fff;
  position: absolute;
  left: -200px;
  top: 56px;
  height: 0;
  overflow: hidden;
  opacity: 0;
  box-shadow: 0 0 5px #ccc;
  transition: all .2s .1s;
  ul {
    display: flex;
    flex-wrap: wrap;
    padding: 0 70px;
    align-items: center;
    height: 132px;
    li {
      width: 110px;
      text-align: center;
      img {
        width: 60px;
        height: 60px;
      }
      p {
        padding-top: 10px;
      }
      &:hover {
        p {
          color: @xtxColor;
        }
      }
    }
  }
}
</style>